1.18.6.2	physiological function	a deletion in the VnfD, VnfG and VnfK gene cluster prevents V-dependent nitrogen fixation. A strain defective in both V-nitrogenase and Mo-nitrogenase (EC 1.18.6.1) structural genes shows no residual nitrogen fixing capacity	-, 744787	
1.18.6.2	physiological function	a nifB mutant lacking a small Fe-S cluster that is a precursor of FeMo-co, is unable to grow diazotrophically, even in presence of vanadium, in the absence of molybdenum	745197	
1.18.6.2	physiological function	an insertion mutant in VnfY has 10fold less V-containing nitrogenase activity and exhibits a greatly diminished level of V label incorporation into the V-dependent dinitrogenase when compared to the wild-type. VnfY is involved in the biosynthesis or insertion of FeV-co into the V-containing dinitrogenase	-, 745204